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Article | REF: AM3630 V2

Non-linear Viscoelasticity of Polymer Melts

Author: Christian CARROT

Publication date: October 10, 2020

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1. Manifestations of non-linear viscoelasticity

The viscoelastic behaviour of polymers combined with large deformations can induce, in the case of fluids made of molten polymers, a set of specific phenomena of which the best known are swelling at the die exit, the presence of recirculations at the entrance to contractions, the Weissenberg effect and high elongational viscosity.

1.1 Swelling

Figure 1 describes the phenomenon of swelling at the die exit: a molten polymer extruded...

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